Drugs and toxic metals in meats can contribute to neurotoxicity. AGEs (glycotoxins) in animal-based foods may contribute to dementia. Copper has been found in meat (and supplements) and may contribute to Alzheimer’s Disease. Aluminum, added to cheese, has been linked to Alzheimer’s. Even iron has been linked to these neurodegenerative diseases. A banned pesticide, Dieldrin, can still be found in contaminated dairy products. Aspartame consumption has been linked to at least one brain disease.

Artificial colors have been shown to contribute to ADHD symptoms. Arsenic found in chicken has been linked to neurocognitive deficits in children. Licorice has been shown to be harmful, especially during pregnancy. Creatine supplements have been found to be contaminated with heavy metals and are not recommended.

Plant-based foods may provide protection against inflammation and dementia in part due to a low level of aspirin naturally found throughout the plant kingdom. But blue green algae (see here and here) may be linked to Alzheimer’s, Parkinsons, and Lou Gehrig’s disease. Spirulina may also contain harmful neurotoxins.